DESIGN COMPARISON & RELIABILITY OF RCC & SRC COLUMNS FOR G+7 BUILDINGS (original) (raw)
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Seismic Performance of Multi-Storey RCC Building with Floating Columns
Now a day's floating columns are used in multi-story buildings in urban India. There are various uses of floating columns such as space for assembly hall, reception lobbies and parking purpose etc. Such features are highly undesirable in building built in seismically active areas. Due to discontinuity in load transfer path result in poor performance of building. In this paper an attempt is made to study the comparison of seismic performance of building with normal building and floating columns building for various seismic zones in case of medium soil. For this purpose Pushover analysis is adopted to get performance point and hinge pattern in a multi-storey buildings. To achieve this objective, model of G+7 storey normal building and building with different locations of floating columns are analyzed and the base shear and displacement of multi-storey RCC buildings have been compared. The analysis is being carried out using SAP2000 software package.
EFFECT OF USING HIGH STRENGTH CONCRETE COLUMNS ON THE STRUCTURAL BEHAVIOUR OF R.C BUILDINGS.
Strength, durability and stability are the main criteria for material selection and design in the construction industry. Consequently, development and enhancement of construction materials is always an active and attractive field for engineers and researchers. Elevated temperature (fire) is a potential threat for any structural buildings that can cause a major damage. Response of construction materials exposed to elevated temperature or fire requires a full study and analysis with lessons learned from previous cases. High strength concrete (HSC) has been used in the lower story columns of high rise buildings owing to its qualities over normal strength concrete (NSC) in many countries. But, the full structural qualities of the HSC were unable to be used because of insufficient information regarding the structural behaviour of the material and its properties. Columns moment-curvature curves were developed and maximum inter story drifts were obtained for the different frame models with variation in columns concrete strength. The study shows that frames with HSC columns have got lower stiffness and performed well in satisfying ductility demand. The maximum inter storey drifts are slightly higher for frames with HSC columns, but the contribution of the concrete strength in resisting the lateral deformations was significant. Economic comparisons were also made and it was found that the most economical frame corresponds to frame with the highest columns concrete strength.
Seismic Performance Assessment of a Multistoried Building and Retrofitting of RC Columns
IOSR Journal of Mechanical and Civil Engineering, 2017
Earthquake is a major concerned natural disaster that causes great damage to the structure. Many multistoried commercial, factory and also residential building in Bangladesh are not designed properly considering seismic loads and also seismic zone effects, thereby large storey displacement and cracks have been observed in the structures. In the present study, a G+10 storied factory building is considered and finite element analysis software ETABS 2015 is used to determine the seismic demand and capacity of each structural element considering seismic zone 1 and zone 3. The building is preliminary designed and analyzed for zone 1 and found safe against seismic loads but vulnerable at zone 3. In the developing countries like Bangladesh, RC jacketing method is popular due to its cost effectiveness comparing with other strengthening methods. Therefore, in this study, a guideline for strengthening of columns only by RC jacketing method is discussed and analyzed. The columns having Demand Capacity Ratio (DCR) ratio more than 1.0 found from analysis are considered to strengthen. Pushover analysis is done to determine the performance of the structure before and after retrofitting and it is found that structure after retrofit have more base shear and displacement capacity, and less storey drift compared to unretrofitted structure.
EFFECT OF STEEL BRACING ON VERTICALLY IRREGULAR R.C.C BUILDING FRAMES UNDER SEISMIC LOADS
Earthquakes are one of the most life threatening, environmental hazardous and destructive natural phenomenons that causes shaking of ground. This result in damage to the structures, hence we need to design the buildings to withstand these earthquakes which may occur at least once in the life time of the structure. Structures possess less stiffness and strength in case of irregular configured frames; to enhance this, lateral load resisting systems are introduced into the frames. In this study, G+5 storey building model has been analyzed considering different types of vertical geometric irregularities and steel bracings using pushover analysis with the help of ETABS 9.7 software. Addition of X type brace, V type Brace and Inverted V/K type brace shows that use of X-type of bracing is found more suitable to enhance the performance of the irregular buildings.
Seismic Analysis of Multi-Storey R.C StructuralFrames with and Without Floating Columns
International journal of engineering research and technology, 2019
Rapid civilization leads to construction of thousands of buildings in urban areas. Now days, multi-storied R.C. framed structures are common in urban regions in the cities like Hyderabad, Bangalore, New Delhi, Chennai, Maharashtra, Pune etc. Due to thickly populated urban regions the buildings are extending vertically or going high or becoming more slender. Decades are evident that traffic volume in urban regions is high when compared to semi urban or rural regions. Therefore, the parking of vehicles is significant issue in urban regions leading to consider the parking storey in a building itself. Hence, parking is unavoidable in multi-storey buildings in urban regions in turn leading to create vertically irregular building (floating column buildings). To study the effect of vertically irregularity in buildings created due to parking or by some other instance. 4 mathematical Models of R.C. framed structures are created in ETAB 2016 version. From literature it can be observed that buildings which are having floating columns are more sustainable due to earthquake loading as compared to conventional R.C framed structure and unable to transfer the inertia forces safely to the ground. To study the effect of earthquake on this kind of buildings, Equivalent linear static analysis has been considered. The parameters like fundamental natural time period, fundamental mode shapes with modal mass participation factor, storey displacements, storey drifts, and base shear have been studied in detail.
IRJET, 2020
In the present situation, the multi-storey buildings with floating columns will provide much larger spaces that are required for community halls, shopping malls, and hospitals. The column which is supported on a beam instead of a rigid foundation is known as the floating column. By providing these type of columns, they may satisfy the functional requirements but the structural behavior changes abruptly due to the floating columns and while considering the seismic load with different zones the behavior may cause major accidents of multi storey buildings In this paper, the seismic execution of the structure with or without the skimming sections is introduced as far as different boundaries, for example, story drifts, wind forces, story displacements, and axial forces. The structure is broke down by utilizing ETABS programming with zones-III and IV. In this structure the coasting segments are set at different areas at various stories that are considered for the examination. The fundamental point of this exposition is to assess the seismic reaction of the structure under different zones and with floating columns and comparing it with a normal building.
IRJET- Seismic Analysis of Steel-Concrete Composite and Conventional RCC (G+6storey) Building
IRJET, 2021
The need of today is to construct a structure which can withstand seismic force with much lower construction cost. This can be achieved by using composite structures as an alternative to conventional RCC structure. The present study carried out to analyze the structural performance of G+6 storey framed structure subjected to seismic loading of Zone II using ETABS software. Three similar models having same plan configuration is prepared. The comparison of conventional reinforced cement concrete structure with two composite structures having concrete filled steel tubular section (CFST) as column , one with RCC beam and another with steel beam is done and the result obtained is compared in terms of structural performance of following parameters-maximum storey displacement, storey drift, storey shear and storey stiffness.
COMPARATIVE ANALYSIS OF R.C. BUILDING USING STEEL BRACING AND R.C. STRUCTURAL WALL IN GROUND STOREY
2019
Open first storey is a typical feature in the modern multistory constructions in urban India. Such features are highly undesirable in buildings built in seismically active areas; this has been verified in numerous experiences of strong shaking during the past earthquakes. Though multistoried buildings with open (soft) ground floor are inherently vulnerable to collapse due to earthquake load, their construction is still widespread in the developing nations like India. Social and functional need to provide car parking space at ground level far outweighs the warning against such buildings from engineering community. Hence we need to find out an efficient method to provide strength to soft storey in multi-storied buildings. In the proposed work, a comparative analysis was carried out with a Residential R.C. building of six storey (G + 5), located in seismic zone III, modeled with linear elastic dynamic analysis using response spectrum method. Three models of building with open ground storey, RC structural wall and steel bracing in the ground storey were modeled using the software STAAD.Pro V8i. The results were compared on the basis of displacement, shear force, bending moment, axial force and base shear.
IJSR, 2019
There are several types and shapes of shear walls depending mainly on geometry and height of the building. Both type and shape of the shear wall affect the efficiency of resisting lateral loadings. Shear walls are effective structural elements used mainly in multi-story buildings to provide resistance against lateral loadings such as earthquake and wind loadings. In this study, analytical investigation of regular shape building situated in seismic zone II of Bangladesh have been done by pushover analysis to identify the seismic demand and also pushover analysis is performed to determine the performance levels of the building with different shear walls. All Shear walls are modeled by single column model method. The performance levels and drift ratios are compared for 16 building models in both X and Y directions by using ETABS 2016 version. In this study pushover analysis based on FEMA-356 capacity spectrum method employed to analyze the building models. Pushover analysis result shows that double middle core and middle core buildings are more suitable than side shear wall and edge core buildings. All the plastic hinges developed in the buildings are in life safety performance levels. Also the building showed a weak beam and strong column behavior.
Study the Behavior of Special Columns on Multi Storey Building for Seismic Ground Motions
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Columns are RC building structural elements that are primarily subjected to axial load and moments as they transport them from the superstructure to the substructure. Columns of various shapes and sizes are used. Popular column shapes include square, rectangular, and circular columns, as well as L-shaped, T-shaped, and (+) shaped columns, which are uncommon but provide more interior space than commonly used column shapes. This study aims to examine the seismic performance of multistorey G+10 buildings with Rectangular columns and building with specially shaped columns. According to IS Code 1893(part 1):2016, the proposed buildings are analyzed using equivalent static analysis for zone IV. ETABs are used to analyze the models. After analysis, we conclude that buildings having special columns are safer and have more space as compared to the regular shaped column buildings